Maya version problem about glass.

[heng-wei.nien]

Hi guys.
I'm freshman to use this render.I don't know why the picture have some noise point on my model and it's reflection.(Like the red circle side)

This one is less but I couldn't remove "them".(Orange circle, don't care about red one)

Are those normal in this render?
Samples 2500
Anybody know hot to fix it?

[nuno1980]

Welcome to heng-wei.nien!


What's your videocard?

- Try to uncheck "fake shadows" in specular material because the caustics are bad and unrealistic.
- Try to change to PMC kernel because this kernel is less noises than and much better caustics than PT at same samples per pixel (spp).
- Try to increase spp from 2500 to 5000 or 10000. If you change "caustic blur" from 0.01 to 0.00 then you increase spp to 10000 or 15000.
- Try to increase maxdepth (PMC kernel settings) from default (as 8 diffuse and 24 specular) to 80 spec for eliminate blacks in glass.

Your glass material has dispersion - very good for real-life! But it's very important that all specular materials must have dispersion at real-life.

[heng-wei.nien]

Thanks!
My GPU card is GTX980Ti on MacOS.
I try it but more noise on it and time more longer.

Do I reinstall OC plugin for maya?
Or somethings I use wrong？

[nuno1980]

Ok but I can't read white text and your image looks bad quality because JPEG is bad. Therefore, I'm recommended that you try to save PNG.

Your GTX 980 Ti is very good for PMC.
Looks noises!?! Because 750 S/px is toooo low.

[bepeg4d]

Hi heng-wei.nien,
what happen if you change the White saturation value from 0 to 1 in the Imager settings?
If the dots in the orange area become white, then I guess that there are some exagerated settings in your lighting or material set up
Anyway, if you need coustics, then go with PMC, if don't, then switch to Path Tracing and reduce the GI Clamp value at around 10/1... you will see a great improvement with white points removal at low sampling.
ciao beppe